In fact there are at least two pieces of evidence which show that there is in fact a massive amount of leakage.

1. By calculating the amount of water going into the mini-landfill via rainfall statistics, and checking that against the amount that is captured, if there were no leak, the two measurements would be the same. But when the volume of water calculated from the amount of rain falling on the area is compared to the amount that is retrieved, there is a massive discrepancy. About 1/3 of the rainwater is not being captured. Catalyst measures the amount being pumped out, but does not release that information to Ministry of Environment.